Map all 754 skills to MITRE ATT&CK v19.1

- Add validated mitre_attack frontmatter to all 754 skills (286 distinct
  techniques), verified against MITRE ATT&CK v19.1 via the official
  mitreattack-python library: 0 revoked, deprecated, or invalid IDs
- Curate precise per-skill technique IDs for forensics, malware-analysis,
  threat-intel, and red-team skills (e.g. DCSync -> T1003.006,
  Kerberoasting -> T1558.003, Pass-the-Ticket -> T1550.003)
- Reconcile v19.1 tactic restructuring: Defense Evasion split into
  Stealth (TA0005) and Defense Impairment (TA0112); revoked T1562.*
  family and T1070.001/.002 remapped to active equivalents (T1685.*)
- Normalize word-split tags across 35 skills (remove filename-derived
  stopword tags, add semantic cybersecurity tags)
- Add api-reference.md for 3 skills that were missing it
- Update README ATT&CK section with accurate v19.1 tactic distribution

skills/extracting-iocs-from-malware-samples/SKILL.md

@@ -1,9 +1,11 @@
 ---
 name: extracting-iocs-from-malware-samples
-description: 'Extracts indicators of compromise (IOCs) from malware samples including file hashes, network indicators (IPs,
-  domains, URLs), host artifacts (file paths, registry keys, mutexes), and behavioral patterns for threat intelligence sharing
-  and detection rule creation. Activates for requests involving IOC extraction, threat indicator harvesting, malware indicator
-  collection, or building detection content from samples.
+description: 'Extracts indicators of compromise (IOCs) from malware samples including
+  file hashes, network indicators (IPs, domains, URLs), host artifacts (file paths,
+  registry keys, mutexes), and behavioral patterns for threat intelligence sharing
+  and detection rule creation. Activates for requests involving IOC extraction, threat
+  indicator harvesting, malware indicator collection, or building detection content
+  from samples.
 
   '
 domain: cybersecurity
@@ -22,6 +24,11 @@ nist_csf:
 - RS.AN-03
 - ID.RA-01
 - DE.CM-01
+mitre_attack:
+- T1027
+- T1055
+- T1140
+- T1497
 ---
 
 # Extracting IOCs from Malware Samples